274 lines
8.1 KiB
C
274 lines
8.1 KiB
C
/*
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* Copyright 2012 Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/module.h>
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#include <linux/mempool.h>
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#include <linux/errno.h>
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#include <linux/spinlock.h>
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#include <linux/kallsyms.h>
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#include "fnic_io.h"
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#include "fnic.h"
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unsigned int trace_max_pages;
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static int fnic_max_trace_entries;
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static unsigned long fnic_trace_buf_p;
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static DEFINE_SPINLOCK(fnic_trace_lock);
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static fnic_trace_dbg_t fnic_trace_entries;
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int fnic_tracing_enabled = 1;
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/*
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* fnic_trace_get_buf - Give buffer pointer to user to fill up trace information
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*
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* Description:
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* This routine gets next available trace buffer entry location @wr_idx
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* from allocated trace buffer pages and give that memory location
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* to user to store the trace information.
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*
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* Return Value:
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* This routine returns pointer to next available trace entry
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* @fnic_buf_head for user to fill trace information.
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*/
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fnic_trace_data_t *fnic_trace_get_buf(void)
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{
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unsigned long fnic_buf_head;
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unsigned long flags;
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spin_lock_irqsave(&fnic_trace_lock, flags);
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/*
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* Get next available memory location for writing trace information
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* at @wr_idx and increment @wr_idx
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*/
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fnic_buf_head =
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fnic_trace_entries.page_offset[fnic_trace_entries.wr_idx];
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fnic_trace_entries.wr_idx++;
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/*
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* Verify if trace buffer is full then change wd_idx to
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* start from zero
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*/
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if (fnic_trace_entries.wr_idx >= fnic_max_trace_entries)
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fnic_trace_entries.wr_idx = 0;
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/*
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* Verify if write index @wr_idx and read index @rd_idx are same then
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* increment @rd_idx to move to next entry in trace buffer
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*/
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if (fnic_trace_entries.wr_idx == fnic_trace_entries.rd_idx) {
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fnic_trace_entries.rd_idx++;
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if (fnic_trace_entries.rd_idx >= fnic_max_trace_entries)
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fnic_trace_entries.rd_idx = 0;
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}
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spin_unlock_irqrestore(&fnic_trace_lock, flags);
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return (fnic_trace_data_t *)fnic_buf_head;
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}
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/*
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* fnic_get_trace_data - Copy trace buffer to a memory file
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* @fnic_dbgfs_t: pointer to debugfs trace buffer
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*
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* Description:
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* This routine gathers the fnic trace debugfs data from the fnic_trace_data_t
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* buffer and dumps it to fnic_dbgfs_t. It will start at the rd_idx entry in
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* the log and process the log until the end of the buffer. Then it will gather
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* from the beginning of the log and process until the current entry @wr_idx.
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*
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* Return Value:
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* This routine returns the amount of bytes that were dumped into fnic_dbgfs_t
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*/
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int fnic_get_trace_data(fnic_dbgfs_t *fnic_dbgfs_prt)
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{
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int rd_idx;
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int wr_idx;
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int len = 0;
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unsigned long flags;
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char str[KSYM_SYMBOL_LEN];
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struct timespec val;
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fnic_trace_data_t *tbp;
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spin_lock_irqsave(&fnic_trace_lock, flags);
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rd_idx = fnic_trace_entries.rd_idx;
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wr_idx = fnic_trace_entries.wr_idx;
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if (wr_idx < rd_idx) {
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while (1) {
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/* Start from read index @rd_idx */
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tbp = (fnic_trace_data_t *)
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fnic_trace_entries.page_offset[rd_idx];
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if (!tbp) {
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spin_unlock_irqrestore(&fnic_trace_lock, flags);
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return 0;
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}
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/* Convert function pointer to function name */
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if (sizeof(unsigned long) < 8) {
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sprint_symbol(str, tbp->fnaddr.low);
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jiffies_to_timespec(tbp->timestamp.low, &val);
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} else {
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sprint_symbol(str, tbp->fnaddr.val);
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jiffies_to_timespec(tbp->timestamp.val, &val);
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}
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/*
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* Dump trace buffer entry to memory file
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* and increment read index @rd_idx
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*/
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len += snprintf(fnic_dbgfs_prt->buffer + len,
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(trace_max_pages * PAGE_SIZE * 3) - len,
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"%16lu.%16lu %-50s %8x %8x %16llx %16llx "
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"%16llx %16llx %16llx\n", val.tv_sec,
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val.tv_nsec, str, tbp->host_no, tbp->tag,
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tbp->data[0], tbp->data[1], tbp->data[2],
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tbp->data[3], tbp->data[4]);
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rd_idx++;
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/*
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* If rd_idx is reached to maximum trace entries
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* then move rd_idx to zero
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*/
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if (rd_idx > (fnic_max_trace_entries-1))
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rd_idx = 0;
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/*
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* Continure dumpping trace buffer entries into
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* memory file till rd_idx reaches write index
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*/
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if (rd_idx == wr_idx)
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break;
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}
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} else if (wr_idx > rd_idx) {
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while (1) {
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/* Start from read index @rd_idx */
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tbp = (fnic_trace_data_t *)
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fnic_trace_entries.page_offset[rd_idx];
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if (!tbp) {
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spin_unlock_irqrestore(&fnic_trace_lock, flags);
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return 0;
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}
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/* Convert function pointer to function name */
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if (sizeof(unsigned long) < 8) {
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sprint_symbol(str, tbp->fnaddr.low);
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jiffies_to_timespec(tbp->timestamp.low, &val);
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} else {
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sprint_symbol(str, tbp->fnaddr.val);
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jiffies_to_timespec(tbp->timestamp.val, &val);
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}
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/*
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* Dump trace buffer entry to memory file
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* and increment read index @rd_idx
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*/
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len += snprintf(fnic_dbgfs_prt->buffer + len,
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(trace_max_pages * PAGE_SIZE * 3) - len,
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"%16lu.%16lu %-50s %8x %8x %16llx %16llx "
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"%16llx %16llx %16llx\n", val.tv_sec,
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val.tv_nsec, str, tbp->host_no, tbp->tag,
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tbp->data[0], tbp->data[1], tbp->data[2],
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tbp->data[3], tbp->data[4]);
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rd_idx++;
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/*
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* Continue dumpping trace buffer entries into
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* memory file till rd_idx reaches write index
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*/
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if (rd_idx == wr_idx)
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break;
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}
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}
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spin_unlock_irqrestore(&fnic_trace_lock, flags);
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return len;
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}
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/*
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* fnic_trace_buf_init - Initialize fnic trace buffer logging facility
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*
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* Description:
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* Initialize trace buffer data structure by allocating required memory and
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* setting page_offset information for every trace entry by adding trace entry
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* length to previous page_offset value.
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*/
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int fnic_trace_buf_init(void)
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{
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unsigned long fnic_buf_head;
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int i;
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int err = 0;
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trace_max_pages = fnic_trace_max_pages;
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fnic_max_trace_entries = (trace_max_pages * PAGE_SIZE)/
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FNIC_ENTRY_SIZE_BYTES;
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fnic_trace_buf_p = (unsigned long)vmalloc((trace_max_pages * PAGE_SIZE));
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if (!fnic_trace_buf_p) {
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printk(KERN_ERR PFX "Failed to allocate memory "
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"for fnic_trace_buf_p\n");
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err = -ENOMEM;
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goto err_fnic_trace_buf_init;
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}
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memset((void *)fnic_trace_buf_p, 0, (trace_max_pages * PAGE_SIZE));
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fnic_trace_entries.page_offset = vmalloc(fnic_max_trace_entries *
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sizeof(unsigned long));
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if (!fnic_trace_entries.page_offset) {
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printk(KERN_ERR PFX "Failed to allocate memory for"
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" page_offset\n");
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if (fnic_trace_buf_p) {
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vfree((void *)fnic_trace_buf_p);
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fnic_trace_buf_p = 0;
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}
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err = -ENOMEM;
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goto err_fnic_trace_buf_init;
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}
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memset((void *)fnic_trace_entries.page_offset, 0,
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(fnic_max_trace_entries * sizeof(unsigned long)));
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fnic_trace_entries.wr_idx = fnic_trace_entries.rd_idx = 0;
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fnic_buf_head = fnic_trace_buf_p;
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/*
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* Set page_offset field of fnic_trace_entries struct by
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* calculating memory location for every trace entry using
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* length of each trace entry
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*/
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for (i = 0; i < fnic_max_trace_entries; i++) {
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fnic_trace_entries.page_offset[i] = fnic_buf_head;
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fnic_buf_head += FNIC_ENTRY_SIZE_BYTES;
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}
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err = fnic_trace_debugfs_init();
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if (err < 0) {
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printk(KERN_ERR PFX "Failed to initialize debugfs for tracing\n");
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goto err_fnic_trace_debugfs_init;
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}
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printk(KERN_INFO PFX "Successfully Initialized Trace Buffer\n");
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return err;
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err_fnic_trace_debugfs_init:
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fnic_trace_free();
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err_fnic_trace_buf_init:
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return err;
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}
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/*
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* fnic_trace_free - Free memory of fnic trace data structures.
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*/
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void fnic_trace_free(void)
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{
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fnic_tracing_enabled = 0;
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fnic_trace_debugfs_terminate();
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if (fnic_trace_entries.page_offset) {
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vfree((void *)fnic_trace_entries.page_offset);
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fnic_trace_entries.page_offset = NULL;
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}
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if (fnic_trace_buf_p) {
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vfree((void *)fnic_trace_buf_p);
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fnic_trace_buf_p = 0;
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}
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printk(KERN_INFO PFX "Successfully Freed Trace Buffer\n");
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}
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